A couple of people asked for a layer breakdown of the work flow in substance and the material layers on the boots. Here is a quick look of how it was organized and the start of the boots in zbrush.
special thanks to: Andor Kollar
https://www.artstation.com/illusionist
Here are the major steps and layers that made up the material for the boots. Within each major layer are a minimum of 4 layers of fill layers and corrections. The cracks and missing leather patches were created by using a white mask and deleting sections
Here's a real time look of the boots in Substance.